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28.V.tabung=πr²t
=314/100 x 50 x 50 x 120
=942.000cm³
=942 liter (A)
29.(C)
30.(A)
31.rata²=(20x2)+(23x3)+(25x2)+(26x2)+(30x1)/10
=40+69+50+52+30/10
=241/10
=24,1(B)